feat(reproduce): legacy-test framework + fixed-inlet reproduce pipeline

- Track A (legacy_test): systematic validation scripts for all trained PPO
  models using LegacyCelerisLab. Each test script rebuilds the exact legacy
  CFD environment, runs deterministic inference, and compares against
  SR_analysis reference data using DTW-based comparison. Verified: Karman
  re100/re50/re200, Vortex lamb/taylor all pass (DTW > 0.95).

- Track B (reproduce): Phase 2 open-loop CFD validation + Phase 3 DRL
  inference using the legacy-compatible config (regularized inlet with
  neq_damp=1.0, matching the legacy NBB formula). The inlet scheme fix
  improves new-CFD Karman DTW from 0.916 to 0.943.

- Fixes: action_wrapper sign convention docstring, model inventory
  duplicate entries and missing models, stale config paths in legacy
  run_all_cases.py/run_illusion_vortex.py, illusion label formatting

- Add READMEs and run-all shell scripts for both tracks
- Add .gitignore entries for runtime output directories

Co-authored-by: Cursor <cursoragent@cursor.com>

src/drl_pinball/legacy_test/run_all_legacy_tests.sh

@@ -0,0 +1,78 @@
+#!/bin/bash
+# legacy_test/run_all_legacy_tests.sh
+#
+# Sequential launcher for all Track A (Legacy Test) scripts.
+# Each script uses LegacyCelerisLab which compiles CUDA kernels.
+# A 60-second delay between tests prevents compilation conflicts.
+#
+# Usage:
+#   bash run_all_legacy_tests.sh [DEVICE_ID]
+#   DEVICE_ID defaults to 0 if not provided.
+
+set -euo pipefail
+
+DEVICE_ID="${1:-0}"
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+cd "$SCRIPT_DIR/../../.."  # repo root
+
+log() { echo "[$(date '+%H:%M:%S')] $*"; }
+
+CONDA_ENV="pycuda_3_10"
+DELAY=60
+
+log "=== Legacy Test: Run All ==="
+log "Device: $DEVICE_ID, Conda: $CONDA_ENV, Delay: ${DELAY}s"
+
+# Array of (name, script_path)
+declare -a TESTS=(
+    "Karman Re100:src/drl_pinball/legacy_test/test_karman_cloak_re100.py"
+    "Steady Cloak:src/drl_pinball/legacy_test/test_steady_cloak.py"
+    "Illusion 1L:src/drl_pinball/legacy_test/test_illusion_1L.py"
+    "Vortex Lamb:src/drl_pinball/legacy_test/test_vortex_lamb.py"
+    "Cross-Re Karman:src/drl_pinball/legacy_test/test_karman_cloak_crossre.py"
+    "Illusion 0.75L/1.5L:src/drl_pinball/legacy_test/test_illusion_remaining.py"
+    "Vortex Taylor:src/drl_pinball/legacy_test/test_vortex_taylor.py"
+    "Erase (experimental):src/drl_pinball/legacy_test/test_erase.py"
+)
+
+PASS_COUNT=0
+FAIL_COUNT=0
+declare -a FAILED_NAMES=()
+
+for test_entry in "${TESTS[@]}"; do
+    name="${test_entry%%:*}"
+    script="${test_entry##*:}"
+
+    log ""
+    log "--- $name ---"
+    log "Running: conda run -n $CONDA_ENV python $script --device $DEVICE_ID"
+
+    if conda run -n "$CONDA_ENV" python "$script" --device "$DEVICE_ID"; then
+        log "[PASS] $name"
+        PASS_COUNT=$((PASS_COUNT + 1))
+    else
+        log "[FAIL] $name (exit code $?)"
+        FAIL_COUNT=$((FAIL_COUNT + 1))
+        FAILED_NAMES+=("$name")
+    fi
+
+    # Avoid CUDA compilation conflicts: wait 60s between tests
+    if [[ "$test_entry" != "${TESTS[-1]}" ]]; then
+        log "Waiting ${DELAY}s for CUDA compilation lock to clear..."
+        sleep "$DELAY"
+    fi
+done
+
+log ""
+log "=== Summary ==="
+log "Passed: $PASS_COUNT / $((PASS_COUNT + FAIL_COUNT))"
+
+if [[ $FAIL_COUNT -gt 0 ]]; then
+    log "Failed tests:"
+    for fn in "${FAILED_NAMES[@]}"; do
+        log "  - $fn"
+    done
+    exit 1
+fi
+
+log "All tests passed."